Idea I have for a more successful Reconstruction timeline. Basic POD is that Benjamin Butler becomes Lincoln's VP for the 1864 presidential election. The plot to assassinate Lincoln by John Wilks Booth never unfolds as in otl, and instead a separate conspiracy evolves among Confederate sympathizers and defeated Confederate veterans. On May 21, 1865 about a dozen men attack federal government officials on the outskirts of Washington as Lincoln is delivering an address. Lincoln , Grant and Seward are all killed in the attack, and Butler is injured in a separate assassination attempt. The attack outrages the North, especially after a wider conspiracy among former Confederates is revealed. Butler pursues harsher punishments against former Confederate leaders, eventually leading to the trial and execution of Confederates such as Jefferson Davis, Alexander Stephens, and Robert E. Lee.
Butler's Reconstruction sees the South put under occupation a lot quicker than in otl, with the initial slew of anti-black legislation and the election of former Confederates to office not happening as it did in otl's 1865. With this Reconstruction is a lot more radical in the beginning, with Butler backing some of the land redistribution launched by Sherman and requiring Southern constitutions to guarantee equal protection and full suffrage for black Americans. The 14th and 15th amendments are supported heavily by President Butler, with the 14th ratified by 1867 and the 15th by late 1868.
His radicalism results in an even stronger white backlash in the South, with groups such as the Red Shirts and Klan responding with incredible violence. He is almost assassinated by a member of the Klan in Northern Virginia during the 1868 presidential election campaign. The most notable insurrection occurs in 1869, with Nathan Bedford Forest launching an attack on a federal arsenal in Mississippi and sparking a white revolt. Butler suppresses it by the end of the year, and passes Enforcement Acts to break the Klan.
Overall, Butler's presidency helped prevent the full-blown redemption that saw black Americans suppressed by Jim Crow in the 1890s. Better judges and Federal Election laws passed by President Bingham prevent total disenfranchisement. There is a strong bloc of black politicians in the national government by the early 1900s and the Republican Party never abandons them given the important role they play for them in the South. States such as Louisiana, Mississippi, and South Carolina emerge as centers of black progress in the South with the three having the most friendly political and social environments for them by the 1900s. Despite this, the United States remains an incredibly racially stratified society. Segregation is legal in most states, the racial wealth gap remains absolutely immense, and violence from white Americans remains a persistent threat.